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I read a lot of articles about number format string, ex: http://msdn.microsoft.com/en-us/library/0c899ak8.aspx
I really not understand how to write the best format string. To get a excepted result, I can write some ways. Example: print number 1234567890 as a text "1,234,567,890". These ways give the same result:
1234567890.ToString("#,#")
1234567890.ToString("#,##")
"#,##" is the popular one on internet but why? Please give me some information how to write a good format string. Thanks.
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%s acts as a placeholder for the real value. You place the real value after the % operator. This method is often referred to as the "older" way because Python 3 introduced str. format() and formatted string literals (f-strings).
A format of . 2f (note the f ) means to display the number with two digits after the decimal point. So the number 1 would display as 1.00 and the number 1.5555 would display as 1.56 . A program can also specify a field width character: x = 0.1.
As far as I can see, there is no difference between "#,#" and "#,##": both mean 'format a number with group separators and without the fractional part'. Refer to SSCLI source for general number formatting for the gory details.
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